<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>第4题：权重相同此时比较层叠性</title>
	<style>
		.c1 .c2 div { 
			color: blue;
		}
		
		div #box3 {
			color:green;
		}
		
		#box1 div {
			color:yellow;
		}
	</style>
</head>
<body>
	<div id="box1" class="c1">
		<div id="box2" class="c2">
			<div id="box3" class="c3">
				这行文本是什么颜色的？
			</div>
		</div>
	</div>
</body>
</html>